 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui;

 /**
  * Interface for listening to perspective lifecycle events.
  * <p>
  * This interface may be implemented by clients.
  * </p>
  *
  * @see IPageService#addPerspectiveListener(IPerspectiveListener)
  * @see PerspectiveAdapter
  */
 public interface IPerspectiveListener {
     /**
      * Notifies this listener that a perspective in the given page
      * has been activated.
      *
      * @param page the page containing the activated perspective
      * @param perspective the perspective descriptor that was activated
      * @see IWorkbenchPage#setPerspective
      */
     public void perspectiveActivated(IWorkbenchPage page,
             IPerspectiveDescriptor perspective);

     /**
      * Notifies this listener that a perspective has changed in some way
      * (for example, editor area hidden, perspective reset,
      * view show/hide, editor open/close, etc).
      *
      * @param page the page containing the affected perspective
      * @param perspective the perspective descriptor
      * @param changeId one of the <code>CHANGE_*</code> constants on IWorkbenchPage
      */
     public void perspectiveChanged(IWorkbenchPage page,
             IPerspectiveDescriptor perspective, String changeId);
 }

